Shopov, Y., Petkova, K., Ognianov, O. A new technique for remote location of unknown caves and deep-seated rockslided by unmanned air systems (UAS). София: 2021 с. 14-17,.
Shopov, Y., Petkova, K., Ognianov, O. A new technique for remote location of unknown caves and deep-seated rockslided by unmanned air systems (UAS). София: 2021 с. 14-17,.
Shopov, Y., Petkova, K., Ognianov, O. (2021) A new technique for remote location of unknown caves and deep-seated rockslided by unmanned air systems (UAS), София: с. 14-17,.
Shopov, Y., Petkova, K., & Ognianov, O. (2021). A new technique for remote location of unknown caves and deep-seated rockslided by unmanned air systems (UAS). София: с. 14-17.
Shopov Y, Petkova K, Ognianov O. A new technique for remote location of unknown caves and deep-seated rockslided by unmanned air systems (UAS). София: 2021. p. с. 14-17.
